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Did you take just the one as soon as you had the beginning of symptoms?
Did you take another 2 hours later if the symptoms weren't improved?
Neck stiffness and the other things you mention can be side effects of the Imitrex, even when it takes care of the pain of the migraine. The side effects disappear over the next few hours. Be sure to tell your prescriber about the reaction you had so they can choose a different migraine drug for you.